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首页> 外文期刊>ISIJ international >On the Ductile-Brittle Transition in Lath Martensitic Steel
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On the Ductile-Brittle Transition in Lath Martensitic Steel

机译：板条马氏体钢的脆性转变

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摘要

The inherent brittle mode in dislocated lath martensitic steel is cleavage on {100} planes in the micro-structure. The transition to {100} cleavage fracture on cooling determines the minimum value of the duc-tiule-brittle transition temperature. A half-century of research on the microstructure and toughness of lath martensitic steels has produced a semi-quantitative understanding of the brittle transition to cleavage. The results identify the crystallographic "block" of lath martensite as the effective grain size that controls cleavage, and clarify why the internal structure of a block has the microstructure it adopts. The ductile-brittle transition temperature is strongly affected by the block size. Several effective metallurgical processes are now available to refine the block size without excessive strengthening, leading to martensitic structural steels that combine high strength with good low-temperature toughness.
机译：脱位的板条马氏体钢固有的脆性模式是在微观组织中的{100}平面上分裂。冷却时向{100}解理断裂的转变确定了小晶格-脆性转变温度的最小值。对板条马氏体钢的显微组织和韧性进行了半个世纪的研究，对脆性向解理转变的半定量理解。结果确定了板条马氏体的晶体学“块”是控制解理的有效晶粒尺寸，并阐明了为什么块的内部结构具有所采用的微观结构。韧性-脆性转变温度受块尺寸的强烈影响。现在可以采用几种有效的冶金工艺来精炼块体尺寸而无需过度强化，从而导致马氏体结构钢将高强度与良好的低温韧性相结合。

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